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A three-dimensional quantum dot network stabilizes perovskite solids via hydrostatic strain
- Source :
- Matter; January 2024, Vol. 7 Issue: 1 p107-122, 16p
- Publication Year :
- 2024
-
Abstract
- Compressive strain engineering improves perovskite stability. Two-dimensional compressive strain along the in-plane direction can be applied to perovskites through the substrate; however, this in-plane strain results in an offsetting tensile strain perpendicular to the substrate, linked to the positive Poisson ratio of perovskites. Substrate-induced strain engineering has not yet resulted in state-of-the-art operational stability. Here, we seek instead to implement hydrostatic strain in perovskites by embedding lattice-mismatched perovskite quantum dots (QDs) into a perovskite matrix. QD-in-matrix perovskites show a homogeneously strained lattice as evidenced by grazing-incidence X-ray diffraction. We fabricate mixed-halide wide-band-gap (Eg; 1.77 eV) QD-in-matrix perovskite solar cells that maintain >90% of their initial power conversion efficiency (PCE) after 200 h of one-sun operation at the maximum power point (MPP), a significant improvement relative to matrix-only devices, which lose 10% (relative) of their initial PCE after 5 h of MPP tracking.
Details
- Language :
- English
- ISSN :
- 25902385
- Volume :
- 7
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Matter
- Publication Type :
- Periodical
- Accession number :
- ejs65067316
- Full Text :
- https://doi.org/10.1016/j.matt.2023.10.015